Balance Sheet Components - Allowance for Doubtful Accounts (Details) - Allowance for doubtful accounts - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 197	$ 9,371	$ 9,299
Charged (Credit) to costs and expenses	(30)	1	3
Charged (credit) to other accounts	(12)	73	38
Settlements & write-offs net of recoveries	(49)	(9,248)	31
Balance at end of period	$ 106	$ 197	$ 9,371